Projection system



K. L CURTIS Aug. 18, 1936.

PROJECTION SYSTEM Filed June 12, 1930 5 S h eets-Shee t I andlzq. MATTOR EYJ INVENTOR Kzuzellafils Aug. 18, 1936.- K. L. CURTIS PROJECTIONSYSTEM Filed June 12, 1930 5 Sheets-Sheet 2 INVENTOR (Ell/262V! L.(El/2&3 BY

W, 41841,? M ATTORNEYS Aug. 18, 1936.- K. CURTIS- 2,051,593

PROJECTION SYSTEM Filed June 12, 1930- 5 Sheets-Sheet 3 ATTORNEYJ Aug.18, 1936. -n5 v I 2,051,593

PROJECTION SYSTEM Filed June 12, 1930 5 Sheets-Sheet 4 -IN VENTORKlmel'fil. $0171 5 BY 90am, M09 4. ATTORNEYS I Aug. 18, 1936. K R IS2,051,593

PROJECTION SYSTEM Filed June 12, 1930 5 Sheets-Sheet 5 ATTORNEYSPatented Aug. 18, 1936 PATENT OFFICE PROJECIION SYSTEM mascara KennethL. Curtis, New York, N. Y., assignor to Trans-Luz Daylight PictureScreen Corporation, New York, N. Y., a corporation of DelawareApplication June 12, 1930, Serial No. 460,571

15 Claims.

My invention relates to a projection system for obtaining single orduplicate images of characters or-representations formed on or borne bya tape, or equivalent.

My invention, in one prominent phase thereof, relates to a projectingsystem wherein the projecting, light beam coacts with a characterbearingtape section to simultaneously produce duplicate images of the samecharacter. My invention, in another prominent phase thereof, relates toa projection system wherein indepedent light beams are obtained from asingle projected light beam and passed to screens, respectively,preferably by similar light-reflecting systems.

My invention relates to a projection system, as aforesaid, wherein thelight-reflecting arrangement is of simple character and of higheificiency.

Various other objects and characteristics of my invention will becomeapparent from the following description taken in connection with theaccompanying drawings.

'My invention resides in the projection system, light-reflecting system,the arrangement for obtaining upright images on one or more screens, thefeatures of construction and combination of parts of the characterhereinafter described and claimed.

For an understanding of my invention and for an illustration of some ofthe many forms thereof, reference is to be had to the accompanyingdrawings, in which:

.Figure 1 is a perspective view, with parts omitted, of a projectionsystem arranged in accordance with my invention;

Fig. 2 is an elevational view of the duplicate light-reflecting systemsof Fig. 1;

Fig. 3 is a plan view, partly in section,'showing elements traversed bythe single projected light beam of Fig. 1 prior to development of the.same into independent light beams;

Fig. 4 is-a perspective view, with parts omitted, of another projectionsystem arranged in accordance with my invention;

Fig. 5 is an elevational view of the duplicate light-reflecting systemsof Fig. 4;

Fig. 6 is a plan view, partly in section, showing elements traversed bythe single projected light beam of Fig. 4 prior to development of thesame into independent light beams;

Fig.7 is an elevational view showing another arrangement of duplicatelight-reflecting systems;- I

Fig. 8'is a perspective view, with parts omitted,

of another form of projection system arranged in accordance with myinvention;

Fig. '9 is a perspective view, with parts omitted, of another form ofprojection system arranged in accordance with my invention;

Fig. 10 is a side elevational view of the projection system shown inFig. 9;

Fig. 11 is a plan view, with parts omitted, of the system shown in Figs.9 and 10;

Fig. 12 is a perspective view, with parts omitted. of another form ofprojection system arranged in accordance with my invention;

Fig. 13 is a plan view of the projection system shown in Fig. 12; and

Fig. 14 is a side elevational view of the projection system shown inFigs. 12 and 13.

Referring particularly to Figs. 1, 2 and 3, A represents any suitablesource of light such, for example, as an incandescent electric lamp,light from which may traverse any suitable condensing lens system hereinshown as comprising condensing lenses L and LI, the resultant projectedlight beam thereafter traversing any suitable projection field whichherein is shown as defined by an aperture l formed in a member 2forming, if desired, a part of the front wall of a suitable lenshousing, not shown.

Beyond the projection field, the aforesaid light beam traverses anysuitable objective or projection lens L3 and then, in any suitablemanner,

is separated into a plurality of independent light beams. As hereinshown, two light beams are obtained from the single light beamtraversing the aperture l and to this end, with the form of my inventionshown in Figs. 1, 2 and 3, a plurality of mirrors M and MI are utilized,said mirrors being so disposed, preferably, that they are spaced alongthe axes of the projected light beam which coacts therewithapproximately midway of their ends. Y

In accordance with the form of my invention illustrated in Figs. 1, 2and 3, the mirror M is of such character that the projected light beamin part passes therethrough and in part is reflected thereby, the partpassing and the part reflected, preferably being approximately equalalthough this may be varied if desired. The mirrror M may be suitablysilvered to effect the function just described or, as illustrated inFig. 1, it may comprise alternate reflecting and transparent sections.The mirror MI is fully reflecting since all of the projected light beampassing thereto should be reflected.

As shown, therefore, the projected light beam coacts with the twomirrors M and MI whereby i there are produced two independent lightbeams which may pass approximately in opposite directions with respectto each other preferably approximately at right angles with respect tothe axis of said projected light beam. However, this arrangement may bevaried as desired so that the two light beams may be obliquely relatedto each other and to the axis of said projected light beam in a desiredmanner.

With the form of my invention herein illustrated in Figs. 1-3, theprojected light beam, while passing substantially in a horizontaldirection, coacts with the mirror system comprising the mirrors M andMI, the latter preferably being so arranged that the respectiveindependentlight beams likewise pass in substantially horizontaldirections.

In accordance with the form of my invention illustrated in Figs. 1, 2and 3, the light beam refiected by the mirror M coacts in successionwith mirrors M2 and M3 the former deflecting said last named light beamso that it passesapproximately vertically and the latter returning saidlast named light beam approximately to a horizontal direction but in adirection the reverse of that taken under the influence of the mirror M.From the mirror M3, said last named light beam passes into coactingrelation with a screen S.

In a manner similar to that described above, the light beam reflected bythe mirror MI passes approximately horizontally to a mirror M4, thenapproximately vertically to a mirror M5, and then approximatelyhorizontally to a screen SI, said last named light beam passingapproximately in opposite directions from the respective mirrors MI andM5.

With the form of my invention shown, the screens S and SI are of thecharacter utilized with through projection or projection of thatcharacter wherein the light beams pass first through the respectivescreens and then reach the eyes of the audience. Accordingly it is therear of the screens which the light beams first engage. As shown, thescreens S and SI are disposed substantially vertically and preferablythey are in substantially parallel relation, the length of the lightpaths between each screen and the objective lens L3 being approximatelyequal.

In accordance with the form of my invention disclosed in Figs. 1, 2 and3, the aforesaid member 2 is adapted to frame any suitablecharacter-bearing surface or member such, for example, as a tape T ofthe character herein illustrated, this tape being such as customarilyissues from stock ticker mechanism. As shown by Figs. 1 and 3, thesection of the tape T in the projection field extends horizontally andis disposed in vertical edgewise relation, i. e., the fiat section ofthe tape is disposed at right angles to the plane of the paper on whichthe drawing is made, Fig. 3. The tape T passes through the projectionfield in a direction from right to left, Figs. 1 and 3; it may issuefrom printing mechanism of any suitable character and it may be pulledor drawn through said projection field by any suitable mechanism. Thus,if desired, said tape may be drawn through the projection field in themanner described in my pending application Serial Number 441,963, filedApril 5, 1930, and the lamp housing, condenser housing and alliedapparatus may be of the character illustrated in Figs. 12-16 of mypending application, Serial Number 454,896, filed May 23, 1930. Or,apparatus for this purpose of any other suitable type may be utilized.

In accordance with my invention, that flat side of the tape T on whichthe characters are printed faces the source of light A. /Under suchcircumstances, the disclosed mirror system causes the these imagesappear, respectively, on the screens S and SI.

Referring to Figs. 4, 5 and 6, there is illustrated a plural-beamreflecting system the same in principle as that heretofore described butdiffering therefrom in some respects.

In Figs. 4, 5 and 6, the source of light, the pro-.

jection field, the tape and the objective lens L3 are the same andrelated the same as heretofore described. However, in lieu of the abovedescribed mirror system for obtaining independent light beams from theprojected light beam, there are utilized crossed mirrors M6 and M? whichmay be supported, and related to each other and to the objective lens L3the same as described in connection with the crossed mirrors illustratedand described in my aforesaid pending application Serial Number 454,896.

' As shown, although not necessarily, the mirrors M6 and M1 are arrangedat angles of degrees with respect to the axis of the projected lightbeam passing from the objective lens L3 whereby the independent lightbeams pass laterally in opposite directions from the axis of saidprojected light beam.

From the mirror M6, one of the independent light beams passes more orless horizontally to a mirror M8 and then more or less vertically to amirror M9, the latter reflecting said light beam preferably in'ahorizontal direction to the screen SI. Similarly, the other independentlight beam passes more or less horizontally to a mirror Mlll, then moreor less vertically to a mirror MII, and then preferably substantiallyhorizontally to the screen S, said screens being adapted for throughprojection and arranged approximately the same as heretofore described.

The system of Figs. 4, 5 and 6 operates the same as heretofore describedin connection with Figs. 1, 2 and 3. Under some circumstances, theutilization of the crossed mirrors M6 and M1 is advantageous because, bythem, the independent light beams are laterally deflected at equaldistances from the objective lens L3 whereas, with the arrangement ofFigs. 1, 2 and 3, the lateral deflection of the independent light beamsoccurs at unequal distances from the objective lens.

Moreover, with the system of Figs. 4, 5 and 6, the mirrors M9 and MIIare so arranged that the screens S and SI may be at the same height,this being advantageous and desirable under some circumstances.

In Fig. 7, I have illustrated another of the many ways in which thelight-reflecting system may be arranged in accordance with my invention.With the arrangement of Fig. '7, the independent light beams areobtained in any suitable manner and they extend approximately inopposite directions and more or less horizontally to the respectivemirrors MI2 and MI3. From the mirror MI2, one of the light beams passesmore or less vertically to the mirror MM and thence to the screen SIwhile, from the mirror MI3, the other light beam passes upwardly to themirror Ml and then to the screen S.

The mirror systems disclosed in Figs. 1-6, are more or less symmetricaland this is true particularly of the arrangement of Figs. 4, 5 and 6. InFig. 7, however, the two mirror systems are nonsymmetrical, it oftenbeing found desirable to utilize such an arrangement in connection withcertain types of installations.

The advantages of my invention are numerous and of importance. Of greatutility is the fact that a minimum number of mirrors are employedthereby preventing waste of light and increasingthe efliciency of thesystem. With the arrangement shown, eachlight-reflecting system includesbut three mirrors, the second mirror being utilized to pass the lightbeam more or less in a vertical direction So that the screens may bedisposed well above the projection apparatus and further to permitrelatively close spacing of the screens while still obtaining lightpaths of a desired length.

As has been disclosed, the three-mirror system is very fiexible inasmuchas the mirrors may be arranged in a variety of ways to secure a desiredarrangement of the screens.

In all of the arrangements heretofore described, the screens arearranged generally in ba'ck-to-back relation although said screens maybe somewhat out of alinement with each other if desired. With such ascreen arrangement, it results that the light beams cross or passthrough each other before reaching the respective screens. This is aninherent feature of my invention arising because of the necessary mirrorarrangements required to obtain correct disposition of the screenimages. It is important because contributing to the compactness of thesystem. Under some circumstances, however, my invention may be practicedwithout causing the light beams to cross each other as described above.

With the forms of my invention heretofore described, the projected lightbeam passes, without reflection, from the source of light to the crossedmirror arrangement, or equivalent. It shall be understood, however, thatmy invention is not to be limited in this respect since it may bedesirable that the projection field together with the tape passingtherethrough be positioned otherwise than as heretofore described, inwhich case, one or more mirrors may be utilized for reflection of themain light beam before the latter comes to the crossed mirrorarrangement, or equivalent. With such a system, the threemirrorreflecting systems operate the same as heretofore described, the chiefdifference involving the reflecting arrangement for the main light beam.It shall be understood, therefore, that in some broad aspects myinvention is applicable to systems wherein the projected light beam ispassed through a tape section in a manner otherwise than as hereinillustrated.

Referring to Fig. 8, there is illustrated a form of my inventionsomewhat different in principle, as regards certain specific aspects,from that heretofore described.

In Fig. 8 the crossed mirror arrangement of Figs. 4 and 6 is shown asdisposed beyond the objective lens L3, said crossed mirror arrangement,or equivalent, serving to produce plural, i pendent light beams from thesingle projected light beam. In the same sense as heretofore described,the independent light beams may extend laterally w h p ct to the opticalaxis of the projected light beam and they may pass, in oppositedirections, or approximately so, directly into coacting relation withthe respective screens S and SI. In other words, with the form of myinvention illustrated in Fig. 8, no mirrors need be interposed betweenthe crossed mirror arrangement and the screens. Therefore, assuming thatthe objective lens of Fig. 8 is of the same focal character and focussedthe same as in Figs. 1-7 inclusive, it follows that the screens S and SIare necessarily spaced from each other to much greater extent than inFigs. 1-7 inclusive if, in both cases, the image areas on the screensare to be approximately of the same extent.

To the end that the images on the respective screens S and SI may beupright and in normal, readable relation, it follows that the tape Tshould be positioned in the projection field defined by the aperture lin different relation than as described in connection with Figs. l-7. Asshown in Fig. 8, the tape T passes horizontally and in edgewise,vertical relation, the ink forming the characters facing the source oflight A all the same as heretofore described. However, the tape T ofFig. 8, as will readily appear, is in inverted relation with respect tothe position taken thereby in Figs. 1-7 inclusive. That is, thecharacters on the tape are upside down in Fig. 8, whereas in Figs. 1-7inclusive the tape characters are in normal upright position. Further,in Fig. 8, the tape passes from left to right whereas, with thearrangements heretofore described, the tape passes in reverse directionas the parts are shown on the drawings.

Accordingly, with the tape related to the projection field as shown inFig. 8, it follows that the images on the respective screens appear innormal, upright position and move in opposite directions thereacross incorrespondence with the tape movement.

From many important aspects of my invention, plural screens are utilizedas hereinbeforedescribed. It shall be understood, however,.that fromsome aspects my invention is applicable to projection systems involvingbut one screen and a single light-reflecting system. When plural screensare utilized and as hereinbefore described, they are disposed,ordinarily, in parallel, back-toback relation in which case, saidscreens, usually, are in planes crosswise, and moreparticularly, atright angles with respect to the course taken by the tape while passingthrough, the projection field. It shall be understood, however, thatfrom some aspects of my invention, the screens need not be disposed asdescribed above since, under some circumstances, it may be desirable, asnow to be described, to dispose them otherwise thanin parallel relationwith respect to each other.

Referring to Figs. 9, and 11, there is illustrated a form of myinvention which operates independently of the hereinbefore describedcrossed mirrors, or equivalent and wherein the screens are disposed in anovel relation. As shown particularly in Figs. 9 and 10, the mainprojected light beam traverses the objective lens L3, the same asheretofore described, and then coacts with a mirror MIG by which it isreflected upwardly or substantially in a vertical direction, said lightbeam thereafter coacting with a mirror MI! by which it is deflected soas to pass in a horizontal direction or approximately so.

After leaving the mirror MIT, the aforesaid light beam coacts with amirror Ml8 which, in accordance with the form of my invention disclosedin Figs. 9, 10 and 11, is arranged at an angle of approximately 45degrees with respect to the axis of the light beam after leaving themirror M", and which is of such character that a part of said light beampasses therethrough and a part is reflected thereby. Accordingly, thepart of the light beam traversing the mirror Ml8 passes therebeyond andcoacts with a screen SI which, obviously, should be disposed upright-andat right angles to the axis of said last named light beam. The part ofthe light beam reflected by the mirror Mi8 passes at right angles to theaxis of the light beam emanating from the mirror MI I and coacts with ascreen S3 which, obviously,

should be disposed upright and at right angles to the axis of saidreflected light beam.

The mirror M18 may be of any suitable character consonant with thefunction described above. However, ordinarily, said mirror MN! is onewhose surface is silvered in substantially a uniform manner, the degreeof silvering being such that approximately half of the light isreflected while the other half passes therethrough. However, it shall beunderstood that the mirror Ml8 may be of such character that theproportion of reflected and traversing light may be varied otherwisethan as stated.-

With the form of my invention shown in Figs. 9, 10 and 11; the tape Tpasses across the projection field in the. direction of the arrow, Fig.9, the inked side of the tape facing the objective lens L3 and thecharacters being disposed in normal upright position. When thearrangement is as just described, images are produced on the screens S2and S3 as illustrated in Fig. 9, said images being readable from thefront of the screen S2 and from the rear of the screen S3. In otherwords, the screen S2 is of a character adapting it' for throughprojection, the audience viewing that side of said screen-opposite theside engaged by the projecting light beam; the screen S3, however, is ofa character adapting it for reflecting projection, the audience viewingthe same side of said screen S3 as is engaged by the projecting lightbeam.

With the form ofmy invention thus described in connection, with Figs. 9,10 and 11, the screens S2 and S3 are disposed at right angles to eachother, or substantially so, in contra-distinction to the forms of myinvention described in Figs. 1 through 8 inclusive, wherein therespective screens are disposed substantially in parallel'relation. Theright angular relation of the screens S2 and S3 is desirable under somecircumstances in order to meet conditions imposed by the arrangement ofofllces, rooms or the like wherein the projection system is to beinstalled.

With the forms of my invention illustrated by Figs. 4, 5, 6 and 8, thecrossed mirrors M6 and M1 were described as being disposed, preferably,at angles of 45 degrees, respectively, with respect to the axis of themain light beam traversing the objective lens L3, from which it followsthatrv the mirrors Mfiand Ml are disposed at right angles with respectto each other. Under such circumstances and with the disclosedreflecting systems, it resulted that the respective screens are disposedapproximately in parallel back-to-back relation.

With the form of my invention disclosed in Figs. 12, 13 and 14, theaforesaid relation of the crossed mirrors M6 I and MLwith respect toeach other and with respect to the axis of the main light beamstraversing the objective lens L3,.is changed from that heretoforedescribed, and as particularly illustrated in said Figs. 12, 13 and 14,the mirrors M6 and M1 are arranged, respectively, at

angles of approximately 67 degrees with respect to the axis of the mainlight beam traversing the Accordingly, where the mirrors M6 and M! I arearranged as just described, the light beams reflected, respectively,thereby pass no longer substantially at right angles with respect to theaxis of the main light beam traversing the lens L3 but are related atacute angles with respect A thereto.

As shown, the, light beam reflected by the mirror M6 passes more or lesshorizontally to a mirror M20 and then more or less vertically to amirror M2 the light beam from the latter coacting with a screen S4. In asimilar manner, the light beam reflected by the mirror Ml passesapproximately in a horizontal direction to a mirror M22 and thenapproximately vertically to a mirror M23, the light beam passing fromthe latter to a screen S5.

In Fig. 12, the tape T is shown as passing horizontally through theprojection field in edgewise vertical relation, the characters thereonbeing in normal upright relation and the inked taped surfaces facing thesource of light A. Where this relation obtains and with the describedmirror system, the screens S4 and S5 are adapted for "throughprojection, the respective sets of images being readable in their normalupright relation when said screens are vertically disposed and viewedfrom the respective sides opposite to those engaged by the projectinglight beams, respectively.

With the arrangement shown in Figs. 12, 13 and 14, the screens S4 and S5are disposed at right angles with respect to each other, the same asdescribed in connection with Figs. 9, 10 and 11 with the exception thatin Figs. 12, 13 and 14 both of the screens are adapted for through"projection.

The right angular relation of the screens S4 and S5 results fromthedescribed angular relation of the mirrors MB' and M! with respect toeach other and with respect to the axis of the main light beamtraversing the lens L3. In this connection, it shall be understood thatthe mirrors M6 and M! of Figs. 12, 13 and 1 4 may be obliquely relatedto each other differently than as hereinbefore described in order toobtain a relation of screens wherein they are neither parallel norperpendicular to each other.

Although the form of my invention of Figs. 12, 13 and 14 has beendescribed with reference to the crossed mirrors M5 and M1, it shall beunderstood that the invention is not to be so limited because, ifdesired, the arrangement for obtaining the independent light beams maybe otherwise dinarily, my invention is practiced in connection with asingle objective lens but, as regards certain features thereof, theinvention is-not to be thus limited since, under some circumstances, itmay be desirable to utilize a plurality of objective lenses to obtainthe independent light beams.

As hereinbefore described, the tape T is of the transparent orsemi-transparent type, the light beam passing therethrough in order toreach the objective lens. As well, however, as regards certain aspectsof my invention, the tape T may be of the opaque type in which case theprojection is of the character known as reflecting.

In the description of my invention as heretofore stated, thelight-reflecting members have been described as mirrors. It shall beunderstood that these mirrors may be of the conventional type and thatprisms or other mirror equivalents may be utilized in lieu thereof.Accordingly, in the appended claims, the term mirror shall be understoodas having a generic meaning and including mirrors, prisms or the like.

In its preferred arrangements, my invention is practiced in connectionwith ordinary ticker tape. It shall be understood, however, that asregards certain broad aspects thereof, the invention is not to belimited to the utilization of ticker tape since other character-bearingsurfaces, members or slides may be substituted therefor, the latterbeing disposed in or passing through the projection field automaticallyor by manual action as may be desired. Accordingly, in the appendedclaims, the term tape shall be understood as having a generic meaning.

While the invention has been described with respect to certainparticularpreferred examples which give satisfactory results, it will beunderstood by those skilled in the art after understanding theinvention, that various changes and modifications may be made withoutdeparting from the spirit and scope of the invention and it is intendedtherefore in the appended claims to cover all such changes andmodifications.

What is claimed as new and desired to be secured by Letters Patent is:

1. In a projection system, the combination with a projection field alongwhich is movable a tape having characters reading lengthwise thereof, ofa screen disposed in a plane extending cross-wise with respect to thecourse taken by the tape while moving through said projection field, andmeans comprising a light-reflecting system for producing on said screencharacter images which travel horizontally from end to .end thereofsubstantially at right angles with respect to the plane of the tapesection in said projection field.

2. In a projection system, the combination with a projection field alongwhich a character-bearing tape is horizontally movable while disposededgewise, of a screen disposed in a plane extending cross-wise withrespect to the course taken by the tape while moving through saidprojection field, and means comprising a light-reflecting system forproducing images of the tape characters on said screen.

3. In a projection system, the combination with a projection field alongwhich a character-bearing tape is horizontally movable while disposededgewise, of a screen disposed in a plane extending cross-wise withrespect to the course taken by the tape while moving through. saidprojection field, and means comprising a, light-reflecting system forproducing on said screen character images which travel from end to endthereof substantially at right angles with respect to the plane of thetape section in said projection field.

4. In a projection system, the combination with a projection field alongwhich a character-bearing tape is horizontally movable while disposededgewise, and an objective lens traversed by a light beam passing fromsaid projection field along a path, of a mirror for deflecting saidlight beam laterally with respect to said path, a screen disposed in aplane extending cross-wise with respect to the course taken by the tapewhile moving through said projection field, and means for passing thedeflected light beam into engagement with said screen.

5. In a projection system, the combination with a projection field for acharacter-bearing tape, and an objective lens traversed by a light beampassing from said projection field, of means for obtaining a pluralityof independent light beams from said first named light beam, a pluralityof spaced screens, and means comprising duplicate light-reflectingsystems for producing images of the characters on the respectivescreens.

6. In a projection system, the combination with a projection field for acharacter-bearing tape, and an objective "lens traversed by a light beampassing from said projection field, of means for obtaining a pluralityof independent light beams from said first named light beam, a pluralityof spaced screens disposed, respectively, in planes extending crosswisewith respect to the course taken by the tape while moving through saidprojection field, and means comprising duplicate light-reflectingsystems for producing images of the characters on the respectivescreens.

7. In a projection system, the combination with a projection field for acharacter-bearing tape, and an objective lens traversed by a light beampassing from said projection field, of means for obtaining a pluralityof independent light beams from said first named light beam, a pluralityof spaced screens, and means comprising duplicate light-reflectingsystems for producing normal upright images of the characters on therespective screens, each light-reflecting system, beyond said objectivelens, having less than four mirrors.

8. In a projection system, the combination with a projection field alongwhich a character-bearing tape is horizontallymovable while disposededgewise, and an objective lens traversed by a light beam passinghorizontally from said projection field, of means for obtaining aplurality of independent light beams from said first named light beam, apluralityof spaced screens, and means comprising duplicatelight-reflecting systems for producing images of the characters on therespective screens.

9. In a projection system, the combination with a projection field for acharacter-bearing tape, and an objective lens traversed by a light beampassing from said projection field along a path, of means disposed in ahorizontal section of said path for obtaining a plurality of independentlight beams from said first named light beam, said independent lightbeams extending laterally from the horizontal section of said path, anda plurality of screens with which said independent light beams coactrespectively.

10. In a projection system, .the combination with a projection field fora character-bearing tape, and an objective lens traversed by a lightbeam passing from said projection field, of means for obtaining aplurality of independent light beams from said first named light beam, aplurality of spaced screens, and reflecting means for passing saidindependent light beams, respectively, into engagement with saidscreens, said reflecting means causing said light beams to cross eachother while passing toward the respective screens, whereby normalupright images are obtained on said screens.

11. In a projection system, the combination with a projection field fora character-bearing tape, and an objective lens traversed, by a lightbeam passing from said projection field, of means for obtaining aplurality of independent light beams from said first named light beam, aplurality of spaced screens, and reflecting means for passing saidindependent light beams, respectively, into engagement with saidscreens, said reflecting means causing said independent light beams totwice pass approximately in opposite directions before engaging therespective screens.

12. In a projection system,the combination with a projection field alongwhich a characterbearing tape is movable, and an objective lenstraversed by a light beam passing from said projec'tion field, of meansfor obtaining a plurality of independent light beams from said firstnamed light beam, a plurality of spaced vertical screens disposed,respectively, in planes extending crosswise with respect to the coursetaken by the tape while moving through said projection field, andreflecting means for passing said independent light beams, respectively,into engagement with said screens, said reflecting means causing saidlight beams to cross each other while passing toward the respectivescreens, whereby normal upright images are obtained on said screens.

13. In a projection system, the combination with a' projection field fora character-bearing tape, and an objective lens traversed by a lightbeam passing from said projection field, of means for obtaining aplurality of independent light beams from said first named light beam, aplurality of spaced screens, and means comprising duplicatelight-reflecting systems for producing normal upright images of thecharacters on the respective screens, each light-reflecting system,

beyond said objective lens, having less than three mirrors.

14.- In a projection system, the combination with a projection field fora character-bearing tape, and an objective lens traversed by a lightbeam passing from said projection field, of means for obtaining aplurality of independent light beams from said first named light beam, aplurality of spaced screens, and means comprising duplicatelight-reflecting systems for producing normal upright images of thecharacters on the respective screens, each light-reflecting system,beyond said objective lens, having but one mirror.

15. In a stock quotation projecting machine having a. ticker adapted tomark and discharge tape with reading matter readable longitudinally ofthe tape, the combination with a pair of independent and separatedelongated narrow daylight display screens disposed in substantiallyparallel back-to-back relation, of a projecting device removed from saidscreens through which device the marked tape passes, said deviceincluding a source of light, an elongated light aperture along which thetape passes to receive the light rays from said source of light and formimages of the markings on said tape, said light aperture having itslonger dimension disposed transversely of the planes of said screens andsaid tape'following the course defined by said light aperture wherebythe path of tape movement is transversely disposed with respect to theplanes of said screens, means tor splitting said light rays into twosubordinate beams after passing through said tape, and sets ofreflectors so arranged as to direct said last-named beams toward andonto said screens respectively so as to

